THz ID for coal combustion
The permittivity of coals varies systematically with rank in the terahertz band, offering a basis for rapid identification of spontaneous combustion risk.
Qu, Baolin · Wang, Jingxin · Zhu, Hongqing · Hu, Lintao · Liao, Qi
Energy 2024
With increasing coal rank, imaginary permittivity decreases from 0.0447 to 0.0250
After moisture removal, real permittivity increases from 2.292 to 2.315 with rank
With increasing coal rank, imaginary permittivity decreases from 0.0411 to 0.0245